Door lock



June 8, 1965 J. H. HAZES 3,183,127

. DOOR LOCK Filed Feb. 18, 1963 2 Sheets-Sheet 1 ATTORNEYS June 8, 1965J. H. HAZES I 3,183,127

DOOR LOCK Filed Feb. 1a, 1963 2 Sheets-Sheet 2 FIG.3 FIG-6 BY wu MATTORNEYS United States Patent .0

3,188,127 DOOR LOCK Johannes Hendricus Hazes, Amsterdam, Netherlands,

assignor to N.V. Ahrend-Libra, Amsterdam, Netherlands, a corporation ofthe Netherlands Filed Feb.18, 1963, Ser. No. 259,159 Claims priority,application lilzeherlands, Feb. 22, 1962, 9 Claims. ((Il. 292-224) Thisinvention relates to a lock comprising a rotatable lock bolt adapted tobe actuated by handles, to which bolt there is secured a shaft rotatableabout its longitudinal axis and being equipped with a spring tending tokeep said bolt in the locking position, said shaft comprising at leastone cam adapted to be actuated by an actuating member from outside thelock casing through a recess in said lock casing.

The invention aims at providing a lock of this kind adapted to beactuated with the aid of rotatably mounted handles. For this purpose thelock according to the invention is characterized in that the actuatingmember is slidably arranged on the connecting rod of the handles whichare rotatably mounted in door rosettes, said member comprising at itsone end a cam cooperating with the shaft cam and at its other end one ormore cams cooperating with one or more fixedly arranged cams. Inconsequence of the fact that the actuating member is provided on bothsides with cams which are offset relative to each other the handle needsonly to be turned over a small angle in order to bring the shaft camfrom its one position into its other position. Moreover, the angles ofinclination of the cams may be smaller and thus a smaller force isrequired for turning the handles.

The actuating member is preferably spring-biased. This spring also movesthe handles into their initial position so that this need not be doneanymore by the shaft cam. Consequently the spring which rotates saidshaft cam and therefore also the bolt may be of considerably weakerconstruction than in case said spring would have to serve not only forrotating the bolt but also for returning the handles into their initialposition.

The fixedly arranged cams co-operating with the cams of the actuatingmember may be provided on a door rosette. If desired they may beintegral therewith.

In order to make the angles of inclination of the cams as small aspossible it is necessary that the end of the shaft cam follows thesmallest possible path. In order to ensure this said shaft cam ispreferably located within the circumference of the lock casing.

According to the invention the surface of the shaft cam co-operatingwith the actuating member may be chamfered so that it is in closecontact with the surface of the cam of the actuating member co-operatingtherewith.

A preferred embodiment is characterized in that the actuating member andthe spring are mounted in a sleeve provided with fixing means for thelock easing, into which casing also the cam or cams of the door rosetteproject. Thus it is accomplished that the actuating member contacts theshaft cam always in the same way which assists in making the shaft camas short as possible. It is preferred to apply a cylindricalconstruction both for this sleeve and for the lock casing. V Theinvention will be further explained below with reference to theaccompanying drawings showing by way of example an embodiment of thelock according to the invention.

FIG. 1 shows a longitudinal section'of a lock according to the inventionmounted in a door, the handles being partly shown.

FIG. 2 is a section according to the line II-II of FIG.

1 without the door casing.

3,188,127 Patented June 8, 1965 FIG. 3 is a section according to theline IIIIII of FIG. 1.

FIG. 4 shows the actuating member in perspective.

FIG. 5 is a section of a door rosette provided with cams.

FIGS. 6 and 7 show a detail. 1

In the drawings reference numeral 1 denotes a door casing and referencenumeral 2 indicates a door. In the door casing 1 there has been arrangeda plate 4 with the aid of screws 5, said plate being provided with alocking pin 3. 'A rotatable lock bolt 6 of a lock mounted in the door -2co-operates with said locking pin 3. a

The lock mounted in the door comprises a cylindrical lock casing 7 inwhich a shaft 8 connected to the bolt 6 is rotatably mounted in bearings9, 10. This shaft is equipped with a spring 11 tending to maintain thelock bolt in the position in which the door is locked. On the shaft 8there is secured a cam 12 facing a recess 13 of the lock casing 7. Thisshaft cam 12 is so dimensioned that it is situated inside thecircumference of the lock casing 7. The lock casing comprises two slots14 with which two bent lips 15 of a cylindrical sleeve 16 are inengagement. In this way the lock casing is fixed relative to saidsleeve. The cylindrical sleeve 16 comprises a recess 17 facing therecess 13 of the lock casing 7. A square connecting rod 18 of twohandles 19 passes through the sleeve 16, said handles being rotatablymount ed in two door bearings 20 and 21. On this connecting rod 18 anactuating member 22 comprising a square hole and destined for the shaftcam 12 is slidably but nonrotatably mounted, said actuating member beingbiased by a spring 23 which tends to keep said actuating member in aposition in which the shaft cam 12 may freely move into the position inwhich the bolt assumes the locking position.

The actuating member 22 is at one side provided with a cam 24 with anoblique running-on surface 25 for the end of the rotatable shaft cam 12,said end being correspondingly chamfered so that it is in close contactwith the running-on surface 25. The other end of the actuating member 22comprises a number of cams 26 co-operating with correspondinglychamfered earns 27 of the door bearing 20.

The above-described lock operates as follows:

If one of the handles 19 is turned the cams 26 and 27 will slide alongeach other so that consequently the operating member 22 on theconnecting rod 18 of the handles 19 is displaced. As a result thereofthe cam 24 located at the other side of the actuating member 22 willturn the shaft cam 12. Since, however, when turning the handles 19 theactuating member 22 is turned, the end of the shaft cam 12 will,moreover, run up along the running-on surface 25 of the cam 24 so thatthe end of the shaft cam 12 is given an additional rotary movement. As aconsequence of the fact that the shaft cam 12 is rotated also the shaft8 and the bolt 6 secured thereto are rotated until the bolt is in theunlocked position. If in this position the handle is released the spring23 will move the actuating member 22 back into its initial position sothat the cams 26 and 27 slide along each other until the handles 19 areagain in their initial position. At the same time the cam 24 of theactuating member returns into its initial position so that the spring 11turns the shaft cam 12 back into its initial position. It is obviousthat both movements are carried out simultaneously.

It is obvious that the invention is not restricted to the embodimentdescribed above and shown in the drawings but that it may be modified inmany ways without departing from the scope of the invention. Instead ofproviding five actuating cams 26 and 27 on the actuating for examplealso two of such cams.

r 7 9 Furthermore, the actuating member 22 (see FIG. 4) may also beprovided with abutments 2.8 which co-operate with abutments 29 of thesleeve 16 (FIGS. 6 and 7) and prevent the handles from being turned toofar.

I claim: l

1. A door lock comprising a rotatable lock bolt, a rotatable shaftsecured to said lock bolt, a spring cooperating with said shaft urgingsaid bolt to locking position, a casing surrounding said shaft having arecess, a cam upon said shaft projecting into said recess, an actuatingmember located outside said casing cooperating with is provided on saiddoor for said handles and said fixed cam is provided on said bearing.

3. A door lock according to claim 1, in which said actuating member andsaid biasing spring are mounted in a sleeve connected to said casing andsaid fixed cam projects into said sleeve.

4. A door lock as set forth in claim 3 wherein said actuating member isprovided with an abutment and said sleeve is provided with abutmentscooperating with said abutment on said actuating member.

5. A door lock according to claim 3 in which said cam on said shaftprojects withinthe circumference of said sleeve.

References Cited by the Examiner UNITED STATES PATENTS 2,355,449 8/44Lakin 292336.3 2,573,028 10/51 Kramer 292-336.3

M. HENSON WOOD, JIL, Primary Examiner.

1. A DOOR LOCK COMPRISING A ROTATABLE LOCK BOLT, A ROTATABLE SHAFTSECURED TO SAID LOCK BOLT, A SPRING COOPEATING WITH SAID SHAFT URGINGSAID BOLT TO LOCKING POSITION, A CASING SURROUNDING SAID SHAFT HAVING ARECESS, A CAM UPON SAID SHAFT PROJECTING INTO SAID RECESS, AN ACTUATINGMEMBER LOCATED OUTSIDE SAID CASING COOPERATING WITH SAID CAM THROUGHRECESS, A ROD UPON WHICH SAID ACTUATING MEMBER IS SLIDABLY ANDNON-ROTATABLY MOUNTED, A SPRING BIASING SAID ACTUATING MEMBEER, DOORHANDLES MOUNTED ROTATABLY IN A DOOR UPON THE ENDS OF SAID ROD, A FIXEDCAM UPON SAID DOOR, SAID ACTUATING MEMBER HAVING A CAM COOPERATING WITHSAID CAM UPON SAID SHAFT AT ONE END AND AT ITS OTHER END HAVING A CAMCOOPERATING WITH SAID FIXED CAM.